<template>
  <view>
    <view
      v-if="popMenu && (leftBottom || rightBottom || leftTop || rightTop)"
      :class="{
        'uni-fab--leftBottom': leftBottom,
        'uni-fab--rightBottom': rightBottom,
        'uni-fab--leftTop': leftTop,
        'uni-fab--rightTop': rightTop,
      }"
      class="uni-fab"
    >
      <view
        :class="{
          'uni-fab__content--left': horizontal === 'left',
          'uni-fab__content--right': horizontal === 'right',
          'uni-fab__content--flexDirection': direction === 'vertical',
          'uni-fab__content--flexDirectionStart': flexDirectionStart,
          'uni-fab__content--flexDirectionEnd': flexDirectionEnd,
          'uni-fab__content--other-platform': !isAndroidNvue,
        }"
        :style="{ width: boxWidth, height: boxHeight, backgroundColor: styles.backgroundColor }"
        class="uni-fab__content"
        elevation="5"
      >
        <view v-if="flexDirectionStart || horizontalLeft" class="uni-fab__item uni-fab__item--first" />
        <view
          v-for="(item, index) in content"
          :key="index"
          :class="{ 'uni-fab__item--active': isShow }"
          class="uni-fab__item"
          @click="_onItemClick(index, item)"
        >
          <image :src="item.active ? item.selectedIconPath : item.iconPath" class="uni-fab__item-image" mode="widthFix" />
          <text class="uni-fab__item-text" :style="{ color: item.active ? styles.selectedColor : styles.color }">{{ item.text }}</text>
        </view>
        <view v-if="flexDirectionEnd || horizontalRight" class="uni-fab__item uni-fab__item--first" />
      </view>
    </view>
    <view
      :class="{
        'uni-fab__circle--leftBottom': leftBottom,
        'uni-fab__circle--rightBottom': rightBottom,
        'uni-fab__circle--leftTop': leftTop,
        'uni-fab__circle--rightTop': rightTop,
        'uni-fab__content--other-platform': !isAndroidNvue,
      }"
      class="uni-fab__circle uni-fab__plus"
      :style="{ 'background-color': styles.buttonColor }"
      @click="_onClick"
    >
      <view class="fab-circle-v" :class="{ 'uni-fab__plus--active': isShow }"></view>
      <view class="fab-circle-h" :class="{ 'uni-fab__plus--active': isShow }"></view>
    </view>
  </view>
</template>

<script>
let platform = 'other';
// #ifdef APP-NVUE
platform = uni.getSystemInfoSync().platform;
// #endif

/**
 * Fab 悬浮按钮
 * @description 点击可展开一个图形按钮菜单
 * @tutorial https://ext.dcloud.net.cn/plugin?id=144
 * @property {Object} pattern 可选样式配置项
 * @property {Object} horizontal = [left | right] 水平对齐方式
 * 	@value left 左对齐
 * 	@value right 右对齐
 * @property {Object} vertical = [bottom | top] 垂直对齐方式
 * 	@value bottom 下对齐
 * 	@value top 上对齐
 * @property {Object} direction = [horizontal | vertical] 展开菜单显示方式
 * 	@value horizontal 水平显示
 * 	@value vertical 垂直显示
 * @property {Array} content 展开菜单内容配置项
 * @property {Boolean} popMenu 是否使用弹出菜单
 * @event {Function} trigger 展开菜单点击事件，返回点击信息
 * @event {Function} fabClick 悬浮按钮点击事件
 */
export default {
  name: 'UniFab',
  props: {
    pattern: {
      type: Object,
      default() {
        return {};
      },
    },
    horizontal: {
      type: String,
      default: 'left',
    },
    vertical: {
      type: String,
      default: 'bottom',
    },
    direction: {
      type: String,
      default: 'horizontal',
    },
    content: {
      type: Array,
      default() {
        return [];
      },
    },
    show: {
      type: Boolean,
      default: false,
    },
    popMenu: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      fabShow: false,
      isShow: false,
      isAndroidNvue: platform === 'android',
      styles: {
        color: '#3c3e49',
        selectedColor: '#007AFF',
        backgroundColor: '#fff',
        buttonColor: '#3c3e49',
      },
    };
  },
  computed: {
    contentWidth(e) {
      return (this.content.length + 1) * 55 + 10 + 'px';
    },
    contentWidthMin() {
      return 55 + 'px';
    },
    // 动态计算宽度
    boxWidth() {
      return this.getPosition(3, 'horizontal');
    },
    // 动态计算高度
    boxHeight() {
      return this.getPosition(3, 'vertical');
    },
    // 计算左下位置
    leftBottom() {
      return this.getPosition(0, 'left', 'bottom');
    },
    // 计算右下位置
    rightBottom() {
      return this.getPosition(0, 'right', 'bottom');
    },
    // 计算左上位置
    leftTop() {
      return this.getPosition(0, 'left', 'top');
    },
    rightTop() {
      return this.getPosition(0, 'right', 'top');
    },
    flexDirectionStart() {
      return this.getPosition(1, 'vertical', 'top');
    },
    flexDirectionEnd() {
      return this.getPosition(1, 'vertical', 'bottom');
    },
    horizontalLeft() {
      return this.getPosition(2, 'horizontal', 'left');
    },
    horizontalRight() {
      return this.getPosition(2, 'horizontal', 'right');
    },
  },
  watch: {
    pattern(newValue, oldValue) {
      //console.log(JSON.stringify(newValue))
      this.styles = Object.assign({}, this.styles, newValue);
    },
  },
  created() {
    this.isShow = this.show;
    if (this.top === 0) {
      this.fabShow = true;
    }
    // 初始化样式
    this.styles = Object.assign({}, this.styles, this.pattern);
  },
  methods: {
    _onClick() {
      this.$emit('fabClick');
      if (!this.popMenu) {
        return;
      }
      this.isShow = !this.isShow;
    },
    open() {
      this.isShow = true;
    },
    close() {
      this.isShow = false;
    },
    /**
     * 按钮点击事件
     */
    _onItemClick(index, item) {
      this.$emit('trigger', {
        index,
        item,
      });
    },
    /**
     * 获取 位置信息
     */
    getPosition(types, paramA, paramB) {
      if (types === 0) {
        return this.horizontal === paramA && this.vertical === paramB;
      } else if (types === 1) {
        return this.direction === paramA && this.vertical === paramB;
      } else if (types === 2) {
        return this.direction === paramA && this.horizontal === paramB;
      } else {
        return this.isShow && this.direction === paramA ? this.contentWidth : this.contentWidthMin;
      }
    },
  },
};
</script>

<style scoped>
.uni-fab {
  position: fixed;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  justify-content: center;
  align-items: center;
  z-index: 10;
}

.uni-fab--active {
  opacity: 1;
}

.uni-fab--leftBottom {
  left: 5px;
  bottom: 20px;
  /* #ifdef H5 */
  bottom: calc(20px + var(--window-bottom));
  /* #endif */
  padding: 10px;
}

.uni-fab--leftTop {
  left: 5px;
  top: 30px;
  /* #ifdef H5 */
  top: calc(30px + var(--window-top));
  /* #endif */
  padding: 10px;
}

.uni-fab--rightBottom {
  right: 5px;
  bottom: 20px;
  /* #ifdef H5 */
  bottom: calc(20px + var(--window-bottom));
  /* #endif */
  padding: 10px;
}

.uni-fab--rightTop {
  right: 5px;
  top: 30px;
  /* #ifdef H5 */
  top: calc(30px + var(--window-top));
  /* #endif */
  padding: 10px;
}

.uni-fab__circle {
  position: fixed;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  justify-content: center;
  align-items: center;
  width: 55px;
  height: 55px;
  background-color: #3c3e49;
  border-radius: 55px;
  z-index: 11;
}

.uni-fab__circle--leftBottom {
  left: 15px;
  bottom: 30px;
  /* #ifdef H5 */
  bottom: calc(30px + var(--window-bottom));
  /* #endif */
}

.uni-fab__circle--leftTop {
  left: 15px;
  top: 40px;
  /* #ifdef H5 */
  top: calc(40px + var(--window-top));
  /* #endif */
}

.uni-fab__circle--rightBottom {
  right: 15px;
  bottom: 30px;
  /* #ifdef H5 */
  bottom: calc(30px + var(--window-bottom));
  /* #endif */
}

.uni-fab__circle--rightTop {
  right: 15px;
  top: 40px;
  /* #ifdef H5 */
  top: calc(40px + var(--window-top));
  /* #endif */
}

.uni-fab__circle--left {
  left: 0;
}

.uni-fab__circle--right {
  right: 0;
}

.uni-fab__circle--top {
  top: 0;
}

.uni-fab__circle--bottom {
  bottom: 0;
}

.uni-fab__plus {
  font-weight: bold;
}

.fab-circle-v {
  position: absolute;
  width: 3px;
  height: 31px;
  left: 26px;
  top: 12px;
  background-color: white;
  transform: rotate(0deg);
  transition: transform 0.3s;
}

.fab-circle-h {
  position: absolute;
  width: 31px;
  height: 3px;
  left: 12px;
  top: 26px;
  background-color: white;
  transform: rotate(0deg);
  transition: transform 0.3s;
}

.uni-fab__plus--active {
  transform: rotate(135deg);
}

.uni-fab__content {
  /* #ifndef APP-NVUE */
  box-sizing: border-box;
  display: flex;
  /* #endif */
  flex-direction: row;
  border-radius: 55px;
  overflow: hidden;
  transition-property: width, height;
  transition-duration: 0.2s;
  width: 55px;
  border-color: #dddddd;
  border-width: 1rpx;
  border-style: solid;
}

.uni-fab__content--other-platform {
  border-width: 0px;
  box-shadow: 0 0 5px 2px rgba(0, 0, 0, 0.2);
}

.uni-fab__content--left {
  justify-content: flex-start;
}

.uni-fab__content--right {
  justify-content: flex-end;
}

.uni-fab__content--flexDirection {
  flex-direction: column;
  justify-content: flex-end;
}

.uni-fab__content--flexDirectionStart {
  flex-direction: column;
  justify-content: flex-start;
}

.uni-fab__content--flexDirectionEnd {
  flex-direction: column;
  justify-content: flex-end;
}

.uni-fab__item {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 55px;
  height: 55px;
  opacity: 0;
  transition: opacity 0.2s;
}

.uni-fab__item--active {
  opacity: 1;
}

.uni-fab__item-image {
  width: 25px;
  height: 25px;
  margin-bottom: 3px;
}

.uni-fab__item-text {
  color: #ffffff;
  font-size: 12px;
}

.uni-fab__item--first {
  width: 55px;
}
</style>
